1 //=- llvm/Analysis/PostDominators.h - Post Dominator Calculation-*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file exposes interfaces to post dominance information.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_ANALYSIS_POST_DOMINATORS_H
15 #define LLVM_ANALYSIS_POST_DOMINATORS_H
17 #include "llvm/Analysis/Dominators.h"
21 /// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
22 /// compute the a post-dominator tree.
24 struct PostDominatorTree : public DominatorTreeBase {
25 static char ID; // Pass identification, replacement for typeid
28 DominatorTreeBase((intptr_t)&ID, true) {}
30 virtual bool runOnFunction(Function &F) {
31 reset(); // Reset from the last time we were run...
32 PDTcalculate(*this, F);
36 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
40 unsigned DFSPass(BasicBlock *V, unsigned N);
41 friend void PDTcalculate(PostDominatorTree& PDT, Function &F);
42 friend void PDTCompress(PostDominatorTree& PDT, BasicBlock *V,
44 friend BasicBlock *PDTEval(PostDominatorTree& PDT, BasicBlock *V);
45 friend void PDTLink(PostDominatorTree& PDT,BasicBlock *V,
46 BasicBlock *W, InfoRec &WInfo);
50 /// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
51 /// used to compute the a post-dominance frontier.
53 struct PostDominanceFrontier : public DominanceFrontierBase {
55 PostDominanceFrontier()
56 : DominanceFrontierBase((intptr_t) &ID, true) {}
58 virtual bool runOnFunction(Function &) {
60 PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
61 Roots = DT.getRoots();
62 if (const DomTreeNode *Root = DT.getRootNode())
67 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
69 AU.addRequired<PostDominatorTree>();
73 const DomSetType &calculate(const PostDominatorTree &DT,
74 const DomTreeNode *Node);
77 } // End llvm namespace
79 // Make sure that any clients of this file link in PostDominators.cpp
80 FORCE_DEFINING_FILE_TO_BE_LINKED(PostDominanceFrontier)